Apparatus for rolling sheet-metal pipe



Jan. 5 1926.

I M. J. MuNRc APPARATUS FOR ROLLING SHEET METAL PIPE` 2 Shets-Sheet lFiled July 5, 1924 Invenror Jan. 5 ,1926. 1,568,905"Y M. J. MUNROvAPPARATUS FOR ROLLING SHEET METAL PIPE Filed July 5, 1924 2 sheets-sheet2 FIG 3 Invenor Patented Jan. 5, 1926.

.,UNiTl-:n stares Par-sur euries.

MURDO JOHN MUNRO, OF HAMILTON, ONTARIO,1CANADA.`ASSIGNOR OF ONE-HALF TOGEORGEBOBERT PETRIE, .OF BURLINGTON, CANADA.

i APPARATUS FOR ROLLING SHEET-METAL PIPE.

L Application filed July 5,

To all whom 'it mag/ concern.'

Be it known that I, MURDO JOI-IN MUNuo, a subject of the King of GreatBritain, and a` resident of the city of Hamilton, county of lentworth,Province of Ontario, Doj minion of Canada, have invented certain new anduseful Improvements in Apparatus for Rolling Sheet-Metal Pipe, of whichthe following is the specication.

My invention relates to improvements in apparatus for rolling sheetmetal pipe, such asvstovepipe, and the object of the invention is todevise means whereby this class of pipe .may be safely rolledin highspeed power-driven rolls, thus greatly increasing speed of productionand reducing manufac turing cost.

My invention consists essentially of a power-driven pipe rollingapparatus pro* vided with means for preventing the stock fromre-entering the rolls, all as hereinafter more particularly describedand illustrated in the accompanying` drawings in` which:

Fig. 1 is an end elevation of a pipe rolling apparatus constructedaccording to my invention looking in the direction of the arrow in Fig.2.

Fig. 2 is a front elevation thereof, the left hand side being shown insection on the staggered line 2-2 of Fig. `1.

Fig. 3 is a section on the line 3 2 to an enlarged scale.

Fig. 4 is a detached perspective view of a guard apron used in myinvention.

In the drawings, like characters f reference indicate correspondingparts in the diiferent views.

My invention consists of a pipe rolling apparatus, indicatedcollectively at 1, and `eomprising a main frame 2 in which is` mounted,in fixed bearings, a lower shaft 3.

Vertioally above the shaft 3 is an upper shaft 4 jourualle'd in bearingblocks 5 which are adjustable vertically in guide-ways 6 in the frame 2,threaded spindles 7 controlling this adjustment.

A shaft9 is journalled in vertically adjustable bearing blocks 8 at therear of the machine, the bearing blocks 8 being slidable in verticalguide-ways 10 in the frame 2 3 of Fig.

1924. serial No. 724,415.

and 11 are threaded spindles controlling n the adjustment of the blocks8.'

Mounted upon the parallel shafts 3,` 4z

and `9 respectively are rolls 12, 13 and 14.

From the foregoing it will be noted thatl Mounted upon one end of theushafts 3y and 4 are intermeshing gears 15 and 16 respectively, whilethe end of the shaft 3 carries fast and loose spectively. A. .5

Itl will thus beseen that the lower and upper rolls 12 and 13 aredrivenfrom the shtlft 3 whereas the rear roll 14 is an idler ro `Mounted uponthe main frame 2 at the front thereof, is an inclined stock-supportingtable 19 which is supported upon bracl ets 20 secured to the main frame.

The table 19 is inclined downwardly and forwardly from the entrance ormouth of the rolls 12 and 13.

Secured to the main frame 2 by brackets 21 is an apron 22 which forms aprotecting cover for the top and front of the upper roll 13. This apronextends downwardly in front of the roll 13 and terminates in a forwardlydisposed stepped portion 23, the horizontal portion 24 of which isdisposed slightly above the bottom `of the upper roll 13 and the frontflange 25 of which extends downwardly into spaced relation above thetable 19 so as to form a gap 26 between the table and said flangethrough which the stock 27 may pass to enter the rolls.

In Fig. 3 a sheet of metal which has partially passed through the rollsto be formed into a pipe is indicated in full linesI at 27 while in Fig.1 this is indicated in broken lines and in Fig. 2 this stock is omittedentirely.

The construction and operation of my invention is as follows:

The rolls 13 and 14 would be adjusted for the desired' gauge of sheetbeing rolled. This adjustment of the rolls 13 and 14 follows standardpractice and is not a feature of my present invention.

The stock to be rolled is fed from the pulleys 17 and 18 re` l.

table 19 into the rolls and by having this table inclined upwardlytowards the entrance or mouth of the rolls, the stock is -assured ofpassing` upwardly upon the idler l Q3 and be supported thereby, and nomatter how long the rolls may continue to rotate after the sheet haspassed therethrough, said sheet can4A not positively re-enter the rolls.

It will thus be observed that the apron 22 with its step 23 constitues aguard disposed in front of the entrance to the rolls which guardprovides means for positively preventing the sheet from rc3-entering therolls.

Hitherto theA rolling,` ot' stove pipe has been done entirely uponhand-driven machines at low speed, since it has not been possible tocarry out this operation at high speed due to the danger to the hands ofthe operator and to the iact that the pipe reenteled the rolls when highspeed rolling was attempted.

By my invention these disadvantages have been entirely overcome and byits use sheet metal pipe may be rolled in high speed power-driven rolls,thus greatly increasing speed of production and lowering manufacturingcost.

W'hat I claim as my invention is:

In apparatus for rolling sheet metal pipe, the combination with thevtrame of the apparatus, and the rolls mounted therein, of a stocksupporting table supported by the frame and inclined downwardly andforwardly from the entrance to the rolls, an apron rigidly secured uponthe frame and forming a protecting cover for the top and front of theupper roll, said apron formed at its lower 'front edge with a forwardlydisposed step located in front of the en trance to thev rolls, the frontflange of said step extending into spaced relation above the table toform a gap between the table and said flange.

MURDO JOHN MUNRO.

